Re: [TRNSYS-users] Tank Temperature Beyond Boiling (Matt Duffy)

Matt,

It isn't that I am trying to limit heat transfer to the tank, but that it is not realistic to have a tank of water over the boiling temperature. In tank type 4 or 60 you can set the boiling temperature so that even if heat is added to it as at nears boiling, the component will process the excess heat as being lost as steam. It seems like there would be an easier way to do this than with an external control.

If not, is there another tank type that simulates boiling, has an internal heat exchanger, and doesn't have any major known issues? Thanks!

---------- Forwarded message ----------
From: Matt Duffy <mduffy@aeieng.com>
To: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users@lists.onebuilding.org>
Cc:
Date: Mon, 15 Jun 2015 13:57:58 +0000
Subject: Re: [TRNSYS-users] Tank Temperature Beyond Boiling

Brad,

The TESS Type534 does not have any built-in heating elements or heating energy sources. It can only have the temperature increase if something “upstream” (or a constant input value for the component), an input, is adding energy to the tank. I suggest you look closely at the components that are adding energy to the tank and perhaps limit that(with some kind of controller) to prevent excessive tank temperatures.

Cheers,

Matt

Matt Duffy
Sustainable

AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Boulevard | Madison, WI 53719

P: 608.236.1207 | F: 608.238.2614
mduffy@aeieng.com | www.aeieng.com

From: TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org] On Behalf Of Bradley Painting
Sent: Saturday, June 13, 2015 10:13 PM
To: trnsys-users@lists.onebuilding.org
Subject: [TRNSYS-users] Tank Temperature Beyond Boiling

Hi,

Does anyone know how to limit the fluid temperature of the vertical cylindrical tank 534-coiled (from TESS library)? It is getting up to about 130 °C. I can't find a parameter to limit this. I was using Type 60c but ran into a bug and technical support suggested I use this model because it has fewer issues.

--

Brad Painting

Master of Science Candidate, Renewable Energy Engineering

Department of Technology & Environmental Design

Appalachian State University

Boone, NC 28608

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Brad Painting

Master of Science Candidate, Renewable Energy Engineering

Department of Technology & Environmental Design

Appalachian State University

Boone, NC 28608

-- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com